Water hardness in Mosty
2.01 mmol/L very hard
Tap water in Mosty is very hard: 2.01 mmol/L (201 mg/L · 11.8 gpg · 11.3 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
Mosty is supplied through the ČEVAK network in South Bohemia; the specific source for Mosty is not confirmed here. Reported hardness is 201.2 mg/L CaCO₃, which is very hard. Scale builds up quickly on heating elements and fittings, so protecting the boiler and washing machine is worth considering.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 2.01 mmol/L |
|---|---|
| Calcium (mg/L) | 56 |
| Magnesium (mg/L) | 15 |
| Utility | ČEVAK a.s. |
How Mosty compares
- Tap water in Mosty is 68 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 363 of 1516 in Czechia (1 = hardest); 76 % of these cities have softer water.
- In Jihočeský kraj it is number 19 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Valtínov, 2 km away (0.5 mmol/L).
- Nearest city with clearly harder water: Muckov, 89 km away (3.01 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Mosty
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Mosty water hard or soft?
It is very hard: 201 mg/L as CaCO₃ (11.8 gpg, 11.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mosty safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
How many grains per gallon is Mosty water?
11.8 gpg, equal to 11.3 °dH, 20.1 °fH or 201 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mosty?
For 201 mg/L (11.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mosty?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026). Method: figure published by the water supplier. ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody · Outdated figure? Tell us